ios - Swift @IBDesignable - @IBInspectable 多变量

Question

我正在尝试为 UILabel 创建一个自定义类，这样我就可以从 Storyboard 中看到结果。我需要更改文本属性以创建大纲标签。

使用目前为止的代码，我可以设法做到这一点，但是我只能添加一个变量。

如果我有多个 var，我会得到以下错误。

> 'var' declarations with multiple variables cannot have explicit
> getters/setters 'var' cannot appear nested inside another 'var' or
> 'let' pattern Getter/setter can only be defined for a single variable

如何使用多个变量？代码:

import UIKit

@IBDesignable
class CustomUILabel: UILabel {
    @IBInspectable var outlineWidth: CGFloat = 1.0, var outlineColor = UIColor.whiteColor() {
        didSet {


                let strokeTextAttributes = [
                    NSStrokeColorAttributeName : outlineColor,
                    NSStrokeWidthAttributeName : -1 * outlineWidth,
                    ]

                self.attributedText = NSAttributedString(string: self.text ?? "", attributes: strokeTextAttributes)

        }
    }



}

Answer 1

正如我在评论中所说 - 您需要将每个变量放在不同的行中。这意味着您需要为它们声明 didSet。像这样:

import UIKit

@IBDesignable
class CustomUILabel: UILabel {
    @IBInspectable var outlineWidth: CGFloat = 1.0 {
        didSet {
            self.setAttributes(self.outlineColor, outlineWidth: self.outlineWidth)
        }
    }

    @IBInspectable var outlineColor = UIColor.whiteColor() {
        didSet {
            self.setAttributes(self.outlineColor, outlineWidth: self.outlineWidth)
        }
    }

    func setAttributes(outlineColor:UIColor, outlineWidth: CGFloat) {
        let strokeTextAttributes = [
            NSStrokeColorAttributeName : outlineColor,
            NSStrokeWidthAttributeName : -1 * outlineWidth,
            ]

        self.attributedText = NSAttributedString(string: self.text ?? "", attributes: strokeTextAttributes)
    }

}